package br.com.informatos.filters;

import java.io.IOException;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

@WebFilter(servletNames={"Faces Servlet"})
public class JPAFilter implements Filter {



	private EntityManagerFactory factory;


	public void init(FilterConfig fConfig) throws ServletException {
		this.factory = Persistence.createEntityManagerFactory("sistema-venda");

	}

	

	public void destroy() {
		this.factory.close();

	}


	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		
		//CHEGADA
		EntityManager manager = this.factory.createEntityManager();
		request.setAttribute("EntityManager", manager);
		manager.getTransaction().begin();

		//FACES SERVLET
		chain.doFilter(request, response);
		
		//SAIDA
		try{
			manager.getTransaction().commit();
		}catch (Exception e) {
			manager.getTransaction().rollback();
		}finally {
			manager.close();
		}
	}



}
